L'effet de la distance du Bec et la température du substrat sur les propriétés des couche minces d'oxyde de zinc (ZnO)

DERBALI, AMMAR (2010) L'effet de la distance du Bec et la température du substrat sur les propriétés des couche minces d'oxyde de zinc (ZnO). Masters thesis, Université Mohamed Khider - Biskra.

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Abstract

The zinc oxide (ZnO) is a materials from family of Transparent conductive oxides (TCO), has a wide band gap (Eg = 3.3 eV). Considering their good properties optoelectronics, it used much there in the domains of thin films, these thin films of ZnO find several applications such as: solar cells, gas sensors, piezoelectric sensors, waves guides... etc. The thin films ZnO can be prepared elaboration by several techniques, such as : spray pyrolysis, spray ultrasonic, thermal evaporation, reactive sputtering, sol gel, laser ablation... etc. In the present work and in the order to obtain conducting transparent layers, ZnO thin films were deposited by ultrasonic spray technique on glass substrates. The but of this work is study The effect of the distance nozzle-substrate and the temperature substrate on the proprieties of ZnO thin films for determination conditions of development of thin layer of ZnO and to improve the property of these layers. These layers dividing with two series:  first series : Change substrate temperature ranging from 250 to 500 °C, with the fixing of the rest of the factors, such as solution concentration deposed and the duration of deposition and nozzle – substrate distance.  Second series : Change nozzle – substrate distance ranging from 1cm to 5cm, with the fixing of the rest of the factors, such as substrate temperature and duration of deposition and solution concentration deposed. These films are analyzed by several techniques : The optical characterization of films was carried out using a UV-Visible spectrometry in the spectral range going from 200 to 2200nm. The analysis of the transmittance spectra enabled us to determine the thicknesses and the optical band gaps films and the index of refraction. The spectra of diffraction of the X-ray allows has the studies of the structural properties by the analysis of the spectra X-ray and allowed us to determine the grains sizes and the constrained .The electrical measurements were carried out using the technique of the two points which makes it possible to deduce electric conductivity from these layers.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Zinc oxide, thin films, technique ultrasonic spray, properties(optical, electrical, structural).
Subjects: Q Science > QC Physics
Divisions: Faculté des Sciences Exactes et des Sciences de la Nature et de la Vie > Département des Sciences de la Matière
Depositing User: Admin02 TMLBiskra
Date Deposited: 08 Nov 2014 12:58
Last Modified: 08 Nov 2014 12:58
URI: http://thesis.univ-biskra.dz/id/eprint/669

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